Add sox package installation in Dockerfile

[boessu]

This is really optional and not really a bugfix. It works without that, but removes a warning you'll face in working with voicebox. The background is completely harmless, but maybe someone triggers that as a "bug". It's up to you to add it or not.

install sox to silence startup warning

librosa/torchaudio probe for SoX as an optional legacy audio backend at
startup, logging:
WARNING: SoX could not be found!
This is harmless (soundfile is the active backend, already in requirements.txt)
but noisy in logs. Installing sox removes the warning at negligible image-size
cost.

Summary by CodeRabbit

• New Features
  • Added SoX audio processing support to the runtime environment.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c7bf9eee-a442-4d51-b422-2f75078691e1

📥 Commits

Reviewing files that changed from the base of the PR and between 51f49de and 7fccbbd.

📒 Files selected for processing (1)

• Dockerfile

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📝 Walkthrough

Walkthrough

The Docker runtime image now installs sox alongside its existing system dependencies.

Changes

Runtime dependency

Layer / File(s)	Summary
Install SoX in runtime image Dockerfile	The runtime image’s apt-installed dependencies now include sox.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: sridhar-3009

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the Dockerfile change to install the sox package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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